Abstract

We investigate the magnetotransport properties of polycrystalline films prepared by spray pyrolysis. The virgin (LCMO) film shows paramagnetic-ferromagnetic [insulator-metal (IM)] transition at . Agdoping induces appreciable enhancement in and interestingly of Agdopedfilms is higher than the corresponding value. In the 30% Agdopedfilm IM transition occurs at which is higher than its . Strong irreversibility is observed in zero field cooled–field cooled magnetization of all the films and the irreversibility temperature increases with Agdoping. This suggests the formation of magnetic clusters above . The pure LCMO film exhibits small magnetoresistance(MR) and rather poor temperature coefficient of resistance (TCR) in the vicinity of the room temperature. In contrast, around room temperature the Agdopedfilms show large MR which is for and decreases to for the pure Agdopedfilm.Agdopedfilms also have good TCR in the vicinity of room temperature.